The ZeRound2/2HR has OTA (Over The Air) technology allowing you to update the firmware of your device via your mobile.
As soon as an update is available, you will receive a warning about the application.
Simply accept the update in the application ZeRound2 settings and then the update will be done automatically.
You can view the current firmware version of your device or the availability of a new update in the ZeRound2 application settings menu (Section: Firmware Update).